Portion of a computer screen with a graphical user interface



The FIGURE is a front view of a portion of a computer screen with a graphical user interface, showing the new design.

The outer broken line rectangle illustrates the computer screen and forms no part of the claimed design. All other broken lines illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a computer screen with a graphical user interface, as shown and described. 